Rem sleep refers to sleep periods in which sleepwalking is likely sleep induced by sleeping pills sleep periods in which a person's eyes move rapidly dreamless sleep sleep with periods of wakefulness

sleep periods in which a person's eyes move rapidly

Explanation:

In REM (Rapid eye movement stage of sleep) a sleeping person has a conscious mind due to which he/she is able to sense his/her dream to be taking place in reality. The brain of a person in this sleep stage is as active as the brain of an awake person.

Due to this conscious dreaming, a person eyes move very fast which is also known as darting of eyes.

Thus, REM sleep refers to sleep periods in which a person's eyes move rapidly

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.